My vote is for Chase Litton. Prototypical NFL size. Give him a red shirt year to learn the system and get some weight on that frame then he will be good to go.
2013 - Starter: Bench So, Backup - Floyd So, 3rd - Eveld Sr
2014 - Starter: Bench Jr, Backup - Floyd Jr, 3rd - Mike White RS Fr, RS - Litton
Starter could be a toss-up for 2014. Floyd might be able to take snaps finally.
2015 - Great position to be in with 2 Sr QBs, 1 RS So and 1 RS Fr